
\begin{table}[htb]
\caption{Robustness check: Table F2 without upper chambers}
\begin{center}
\begin{tabular}{l c c c}
\hline
 & Experiment 1 & Experiment 2 & Experiment 3 \\
\hline
Citizens                                     & $3.17^{*}$        & $4.27^{*}$        & $-2.52^{*}$       \\
                                             & $ [ 2.35;  3.94]$ & $ [ 3.34;  5.15]$ & $ [-3.71; -1.26]$ \\
Benefits                                     &                   &                   & $3.76^{*}$        \\
                                             &                   &                   & $ [ 2.50;  5.07]$ \\
Citizens $\times$ Benefits                   &                   &                   & $3.24^{*}$        \\
                                             &                   &                   & $ [ 1.53;  4.97]$ \\
Left-right ideology                          & $0.74^{*}$        & $0.77^{*}$        & $0.31^{*}$        \\
                                             & $ [ 0.55;  0.92]$ & $ [ 0.58;  0.98]$ & $ [ 0.01;  0.63]$ \\
Citizens $\times$ Ideology                   & $-0.61^{*}$       & $-0.65^{*}$       & $0.45^{*}$        \\
                                             & $ [-0.85; -0.36]$ & $ [-0.93; -0.38]$ & $ [ 0.04;  0.86]$ \\
Benefits $\times$ Ideology                   &                   &                   & $0.12$            \\
                                             &                   &                   & $ [-0.24;  0.50]$ \\
Citizens $\times$ Benefits $\times$ Ideology &                   &                   & $-0.66^{*}$       \\
                                             &                   &                   & $ [-1.21; -0.19]$ \\
Intercept                                    & $3.04^{*}$        & $1.56^{*}$        & $2.85^{*}$        \\
                                             & $ [ 2.42;  3.71]$ & $ [ 0.94;  2.16]$ & $ [ 1.82;  3.75]$ \\
\hline
N                                            & $750$             & $665$             & $746$             \\
\hline
\multicolumn{4}{l}{\scriptsize{\parbox{0.85\linewidth}{$^*$ Null hypothesis value outside the 95\% confidence interval. Entries are unstandardized coefficients from a linear mixed-effect regression model. Bootstrapped confidence intervals in parentheses. Countries function as groups. Support for PTAs is captured on an 11-point scale.}}}
\end{tabular}
\label{tab:tableK2}
\end{center}
\end{table}
